Abstract: The gyratory crushing apparatus includes a bowl having an inner wall which defines a chamber for receiving frangible or friable material to be crushed, the chamber having a central axis and terminating in a throat defining a central discharge opening, a crushing head disposed in the bowl and having upper and lower ends which are interconnected by a peripheral wall which is concentric with respect to a gyratory axis of the head, a support assembly by which the head is supported in the chamber and which includes a shaft, and a drive arrangement coupled to the shaft. The shaft is of integral construction having upper and lower portions, and the head is mounted on the upper portion, with the upper portion having an axis substantially co-incident with the gyratory axis of the head.